Re: Electric for large Planes

"Morgans" <jsmorgan@[EMAIL PROTECTED]
> wrote in message 
news:g7bahd$27n$1@[EMAIL PROTECTED]
>
> "Ed Cregger" <ecregger@[EMAIL PROTECTED]
> wrote
>
>> The reason I ask is because charging parallel Nicad packs is not 
>> considered good practice. The LiPoly packs must have very low and 
>> consistent internal impedances if they can withstand charging in
parallel 
>> constantly.
>
> From what reading I have done, charging in parallel is a definite no-no.

> Shoot, even charging them in series is sometimes even a problem, with
some 
> cells not getting a full charge, and others over charging.  Parallel 
> battery packs are even more difficult to keep balanced.
>
> There has been a move by some to use balancing chargers, which requires 
> that the pack have a separate lead for each cell, and the charger reads 
> each battery individually, and brings each cell to full charge.  Some 
> people counter, saying that if you use good packs and not run them at
too 
> high of an output level, and don't try to charge them too fast, there is

> little need for the fancy balancing chargers.
>
> I put a lot of stock in that for series packs, but don't know if I would

> trust parallel charging packs, in any situation.
>
> What the heck.  This all hurts my brain, too.  I would rather pour some 
> sticky liquid into a container onboard my planes, and allow a chunk of 
> metal right behind the prop make a bunch of noise and mess.  I guess
I'll 
> start some kinda' flame war, just for admitting that, though! <g>
> -- 
> Jim in NC

----------

No argument from me, Jim.

I fiddle with some RTF type of electrics, but they don't do enough for me
to 
give up my engines. In fact, when I'm too feeble to fuss with engines, the

hobby will be pretty much at an end for me. That won't be for a while yet
- 
I hope.

Ed Cregger